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|
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Server where
import Network.Socket
import qualified Data.ByteString as S (ByteString)
import Data.ByteString.Lazy.Char8 as L
( ByteString
, hPutStrLn
, fromChunks
, putStrLn )
import Data.ByteString.Char8
( hGetNonBlocking
)
import System.IO
( Handle
, IOMode(..)
, hSetBuffering
, BufferMode(..)
, hWaitForInput
, hClose
, hIsEOF
)
import Control.Monad
import Control.Monad.Fix (fix)
import Todo
import Control.Concurrent (forkIO)
import Control.Exception (handle,SomeException(..))
import Data.HList
import Data.HList.TypeEqGeneric1()
import Data.HList.TypeCastGeneric1()
newtype ConnId = ConnId Int
deriving Eq
newtype ConnectionFinalizer = ConnectionFinalizer (IO ())
getPacket h = do { hWaitForInput h (-1) ; fmap (fromChunks . (:[])) $ hGetNonBlocking h 1024 }
{-
doServer ::
HList st
=> PortNumber :*: st
-> ( Handle :*: ConnId :*: PortNumber :*: st
-> S.ByteString
-> (() -> IO ())
-> IO () )
-> IO b
-}
doServer port g startCon = runServer2 port (runConn2 g)
where
runConn2 g st (sock,_) = do
h <- socketToHandle sock ReadWriteMode
hSetBuffering h NoBuffering
st'' <- startCon (h .*. st)
handle (\(SomeException _) -> return ()) $ fix $ \loop -> do
let continue () = hIsEOF h >>= flip when loop . not
packet <- getPacket h
g st'' packet continue
let ConnectionFinalizer cleanup = hOccursFst st''
cleanup
hClose h
{-
runServer2 ::
Num num =>
PortNumber -> (num -> (Socket, SockAddr) -> IO b -> IO b) -> IO b
-}
runServer2 st@(HCons port _) go = do
sock <- socket AF_INET Stream 0
setSocketOption sock ReuseAddr 1
bindSocket sock (SockAddrInet port iNADDR_ANY)
listen sock 2
mainLoop sock (ConnId 0) go
where
mainLoop sock idnum@(ConnId n) go = do
con <- accept sock
forkIO $ go (idnum .*. st) con
mainLoop sock (ConnId (n+1)) go
|
